That's a bit like comparing pears to kumquats :biggrin:, as NAUI puts all the physics and other academics in the NAUI Master Scuba Diver course, leaving only the actual leadership content in the DM materials. Since they cover more content, I'd certainly *hope* the PADI DM materials would have more in them than the NAUI DM materials.While this is much I like about NAUI, I find the PADI DM materials to be better.